Slotted Flaps for several RC aircraft

An overview, video inspection, and short explanation of some of the slotted flap mods I have made to several of my RC aircraft. There is no sound, you don’t need to hear me droning on. You can figure out what’s happening from the video. If you have ???’s, please ask. The link for NACA Technical Report 664 is below. It’s an old report, but aerodynamic principles do not change. NACA was the predecessor to NASA. I bet those engineers had a blast researching all these issues.